Two tools for visualizing sound. A stroboscopic tuner. You tell it which note you are aiming for, and then it will show you a red/green bar indicating how close you are coming to hitting it. Perfectly horizontal means you are in tune, sloping down is flat, and sloping up is sharp. An FFT spectrum analyzer. You can see how the complete spectrum evolves over time.
Galexand has created TunerTime that lies within the Music & Audio category. Over 10K users downloaded and installed the tool and its most recent release was on Mar 26, 2018. This application was rated 4.6 on Google Play.
It's free to get the installer of TunerTime, also, you can read users' reviews on Droid Informer. The app runs on Android 2.1 and above. The download of the app doesn't contain viruses or any kind of malware.
From the users' point of view, you can notice banner ads among the drawbacks of this application.